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Juniper Service Provider, Professional (JNCIP-SP) Sample Questions (Q20-Q25):

NEW QUESTION # 20

Click the Exhibit button.
You are troubleshooting an issue for a customer site that uses 10.10.0.0/24 in AS 65224, but you see another AS in the AS path.
Referring to the exhibit, what is the cause of the problem?

A. The local AS is in the process of withdrawing the route from AS 65137.
B. AS 65000 is pre-pending AS 65137 to route advertisements.
C. The local AS is receiving two equal cost routes to 10.10.0.0/24.
D. AS 65137 is advertising the 10.10.0.0/24 prefix.

Answer: B

Explanation:
In the given exhibit, you are observing the BGP routing information for the prefix 10.10.0.0/24. The AS path for this prefix shows `65000 {65137 65224}`. To understand the issue, let's analyze each aspect of the information provided and the options given:
1. **AS Path Analysis**:
- The AS path attribute in BGP is a list of AS numbers that a route advertisement has traversed.
- In this case, the AS path `65000 {65137 65224}` indicates that the route to 10.10.0.0/24 has been advertised through AS 65000, which includes AS 65137 and AS 65224.
2. **Understanding AS Path Prepending**:
- AS path prepending is a technique used by AS administrators to artificially lengthen the AS path.
- By adding their own AS number multiple times into the AS path, they make a route less attractive to others.
- Here, AS 65000 is showing `65137` as part of its AS path, suggesting it might be prepending to manipulate routing decisions.
3. **Options Analysis**:
- **Option A**: "AS 65000 is pre-pending AS 65137 to route advertisements."
- This option suggests that AS 65000 is deliberately adding AS 65137 to the AS path. This matches the observed AS path, where AS 65000 has prepended `65137`.
- Therefore, this is the correct explanation.
- **Option B**: "The local AS is receiving two equal cost routes to 10.10.0.0/24."
- There is no evidence in the exhibit to support the presence of two equal-cost routes.
- **Option C**: "The local AS is in the process of withdrawing the route from AS 65137."
- Route withdrawal would not cause the AS path to include `65000 {65137 65224}`.
- **Option D**: "AS 65137 is advertising the 10.10.0.0/24 prefix."
- While AS 65137 is part of the path, it does not explain the presence of AS 65000 in the path, making this option incorrect.
**Conclusion**:
The AS path `65000 {65137 65224}` is indicative of AS 65000 prepending AS 65137. Therefore, the correct answer is:
**A. AS 65000 is pre-pending AS 65137 to route advertisements.**
**References**:
- Juniper Networks documentation on BGP AS path manipulation and prepending techniques.
- BGP Best Practices and Routing Policies: [Juniper Networks BGP Best
Practices](https://www.juniper.net/documentation/en_US/junos/topics/concept/bgp-best-practices-routing-policie
- RFC 4271, A Border Gateway Protocol 4 (BGP-4): [RFC 4271](https://tools.ietf.org/html/rfc4271) which describes the behavior and attributes of BGP, including AS path prepending.

NEW QUESTION # 21
You want to ensure that a single-area OSPF network will be loop free.
In this scenario, what are two requirements that satisfy this requirement? (Choose two.)

A. The Shortest Path First algorithm must prune looped paths.
B. Nodes within an area must connect in a full mesh.
C. The DR/BDR ensures that each node within an area has the same information in their LSDBs.
D. All nodes within an area must have the same information in their LSDBs.

Answer: A,D

Explanation:
DR/BDR doesn't ensure information sharing within the domain.

NEW QUESTION # 22
Exhibit

You want to implement the BGP Generalized TTL Security Mechanism (GTSM) on the network Which three statements are correct in this scenario? (Choose three)

A. You can implement BGP GTSM between R2 and R1.
B. You can implement BGP GTSM between R2, R3, and R4
C. BGP GTSM requires a TTL of 255 to be configured between neighbors.
D. BGP GTSM requires a firewall filter to discard packets with incorrect TTL.
E. BGP GTSM requires a TTL of 1 to be configured between neighbors.

Answer: B,C,E

Explanation:
Explanation
BGP GTSM is a technique that protects a BGP session by comparing the TTL value in the IP header of incoming BGP packets against a valid TTL range. If the TTL value is within the valid TTL range, the packet is accepted. If not, the packet is discarded. The valid TTL range is from 255 - the configured hop count + 1 to
255. When GTSM is configured, the BGP packets sent by the device have a TTL of 255. GTSM provides best protection for directly connected EBGP sessions, but not for multihop EBGP or IBGP sessions because the TTL of packets might be modified by intermediate devices.
In the exhibit, we can see that R2, R3, and R4 are in the same AS (AS 20) and R1 is in a different AS (AS 10).
Based on this information, we can infer the following statements:
* You can implement BGP GTSM between R2, R3, and R4. This is not correct because R2, R3, and R4 are IBGP peers and GTSM does not provide effective protection for IBGP sessions. The TTL of packets between IBGP peers might be changed by intermediate devices or routing protocols.
* BGP GTSM requires a firewall filter to discard packets with incorrect TTL. This is not correct because BGP GTSM does not require a firewall filter to discard packets with incorrect TTL. BGP GTSM uses TCP option 19 to negotiate GTSM capability between peers and uses TCP option 20 to carry the expected TTL value in each packet. The receiver checks the expected TTL value against the actual TTL value and discards packets with incorrect TTL values.
* You can implement BGP GTSM between R2 and R1. This is correct because R2 and R1 are EBGP peers and GTSM provides effective protection for directly connected EBGP sessions. The TTL of packets between directly connected EBGP peers is not changed by intermediate devices or routing protocols.
* BGP GTSM requires a TTL of 1 to be configured between neighbors. This is not correct because BGP GTSM requires a TTL of 255 to be configured between neighbors. The sender sets the TTL of packets to 255 and the receiver expects the TTL of packets to be 255 minus the configured hop count.
* BGP GTSM requires a TTL of 255 to be configured between neighbors. This is correct because BGP GTSM requires a TTL of 255 to be configured between neighbors. The sender sets the TTL of packets to 255 and the receiver expects the TTL of packets to be 255 minus the configured hop count.

NEW QUESTION # 23
Which two statements are correct about IS-IS interfaces? (Choose two.)

A. If a broadcast interface is in both L1 and L2, one combined hello message is sent for both levels.
B. If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level.
C. If a broadcast interface is in both L1 and L2, separate hello messages are sent for each level.
D. If a point-to-point interface is in both 11 and L2, one combined hello message is sent for both levels.

Answer: C,D

Explanation:
Intermediate System to Intermediate System (IS-IS) is a link-state routing protocol that supports Level 1 (L1), Level 2 (L2), or both (L1/L2) operations. The way IS-IS sends Hello (IIH) packets depends on whether the interface is point-to-point (P2P) or broadcast (LAN).
Evaluating the Answer Choices
# Option A: "If a point-to-point interface is in both L1 and L2, separate hello messages are sent for each level."
* Incorrect!
* On point-to-point (P2P) interfaces, only one combined Hello message is sent for both L1 and L2.
* IS-IS P2P Hellos include both Level 1 and Level 2 TLVs in the same message.

NEW QUESTION # 24
Referring to the exhibit, what must be changed to establish a Level 1 adjacency between routers R1 and R2?

A. Change the level 1 disable parameter under the R2 protocols isis interface ge-l/2/3.0 hierarchy to the level 2 disable parameter.
B. Add IP addresses to the interface ge-1/2/3 unit 0 family iso hierarchy on both R1 and R2.
C. Change the level l disable parameter under the R1 protocols isis interface lo0.0 hierarchy to the level 2 disable parameter.
D. Remove the level 1 disable parameter under the R2 protocols isis interface lo0.0 configuration hierarchy.

Answer: A

NEW QUESTION # 25
......

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